9df9e93914
These were mostly written as part of the coreboot project, so get the standard coreboot license header. memmove.c came from the linux kernel, so also gets the standard coreboot v2 license header, but gets the added attribution that it was derived from the linux kernel. Unlike many coreboot files, this file may not be re-licensed as GPL V3. Change-Id: I1fdc26b543e059f7a42d4b886f7222f4c74b959d Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/12916 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <console/console.h>
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#include <cpu/cpu.h>
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#include <arch/io.h>
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#include <string.h>
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#include <cpu/x86/mtrr.h>
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#include <cpu/x86/msr.h>
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#include <cpu/x86/lapic.h>
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#include <arch/cpu.h>
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#include <device/path.h>
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#include <device/device.h>
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#include <smp/spinlock.h>
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#ifndef __x86_64__
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/* Standard macro to see if a specific flag is changeable */
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static inline int flag_is_changeable_p(uint32_t flag)
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{
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uint32_t f1, f2;
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asm(
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"pushfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"movl %0,%1\n\t"
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"xorl %2,%0\n\t"
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"pushl %0\n\t"
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"popfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"popfl\n\t"
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: "=&r" (f1), "=&r" (f2)
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: "ir" (flag));
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return ((f1^f2) & flag) != 0;
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}
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/* Probe for the CPUID instruction */
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int cpu_have_cpuid(void)
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{
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return flag_is_changeable_p(X86_EFLAGS_ID);
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}
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#else
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int cpu_have_cpuid(void)
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{
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return 1;
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}
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#endif
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int cpu_cpuid_extended_level(void)
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{
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return cpuid_eax(0x80000000);
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}
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int cpu_phys_address_size(void)
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{
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if (!(cpu_have_cpuid()))
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return 32;
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if (cpu_cpuid_extended_level() >= 0x80000008)
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return cpuid_eax(0x80000008) & 0xff;
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if (cpuid_edx(1) & (CPUID_FEATURE_PAE | CPUID_FEATURE_PSE36))
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return 36;
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return 32;
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}
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